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SKF
Spherical Roller Bearings SKF 21306 CC
- Technical data
- Inner diameter
- 30 mm
- Outer diameter
- 72 mm
- Width
- 19 mm
- Material
- Standard bearing steel
- Seal
- None, open bearing
- Cage
- Sheet steel cage
- Clearance
- Normal radial clearance
- Running accuracy
- Dimensional accuracy PN, Running accuracy P5
- Bore
- Cylindrical bore
- Outer ring
- Without groove/lubrication holes
- Version2
- Standard version
- Temperature range
- -30 to +200 °C
- Version
- Explorer
- Weight
- 0,41 kg
| Scale quantity | Your discount | Unit price |
|---|---|---|
| 15 | 3,72 € | 70,88 € |
| 30 | 7,46 € | 67,14 € |
Spherical Roller Bearings SKF 21306 CC
The SKF 21306 CC self-aligning roller bearing compensates for misalignment and, with dimensions of 30x72x19 mm, offers a compact design for high-load shaft mountings.
The 21306 CC self-aligning roller bearing is a double-row roller bearing designed for applications involving high radial forces and misalignment. SKF manufactures this open bearing from standard roller bearing steel (100Cr6) in the Explorer design. Two rows of symmetrical rollers self-align within the hollow spherical raceway of the outer ring. This enables the bearing to compensate for misalignment and shaft deflection during operation without causing additional friction.
What loads can the 21306 CC self-aligning roller bearing accommodate?
The bearing is designed for heavy radial loads as well as axial forces acting in both directions when shaft deflection or misalignment occurs. The integrated sheet steel cage guides the rollers evenly during rotational movement. With key dimensions of a 30 mm bore, 72 mm outer diameter and 19 mm width, the design is suitable for compact shaft mountings requiring angular movement.
What should be borne in mind regarding P5 running accuracy and the outer ring?
This model combines PN dimensional accuracy with the enhanced P5 running accuracy. The tighter concentricity tolerance of the inner and outer rings contributes to low vibration at higher speeds. Design considerations: The outer ring has neither a groove nor a lubrication bore. Lubricant is supplied from the side via the housing design. As the bearing is of open design, a customer-supplied seal protects it from contamination.
What are the dimensions of the 21306 CC self-aligning roller bearing?
With an internal bore of 30 mm, an external diameter of 72 mm and a width of 19 mm, the component has standardised key dimensions for compact roller bearings.
What do the tolerance classes PN and P5 mean for this bearing?
The specification combines the standard dimensional accuracy PN for mounting dimensions with the tighter running accuracy P5. This reduces runout deviations and ensures smooth rotational behaviour on the shaft.
How is lubrication carried out in the version without a lubrication groove?
As the outer ring has neither a ring groove nor lubrication holes, grease or lubricating oil enters the bearing from the side. The supply and sealing must be provided by the design of the bearing cover or the housing.
What is the approved temperature range for the spherical roller bearing?
Manufactured from standard roller bearing steel 100Cr6 with a sheet steel cage, the bearing is designed for a temperature range of -30 to +200 degrees Celsius. The lubricant must be suitable for the respective operating temperature.
What does the ‘CC’ designation mean on SKF spherical roller bearings?
At SKF, the suffix ‘CC’ denotes a design featuring a sheet-steel cage and symmetrical rollers. This design ensures low-friction guidance of the rolling elements under combined radial and axial loads.
SKF Group
Sven Wingquists Gata 2, 415 50 Gothenburg, Sweden
info@skf.com, https://www.skf.com/uk/footer/site-ownership
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